Datawell BV RX-C4 Скачать руководство пользователя страница 37 | Manualshive

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37

Example 2:

a “maximum setup” for 10 km mainly over fresh water ice with other obstacles will have an
approximate loss of:

+ 2

dB

(transmit antenna, see A.2)

- 136

dB

(distance over fresh water ice, see A3.1)

- 10

dB

(max. wave height 8 meters, see A.3.5)

- 10

dB

(some obstacles)

+ 10

dB

(normal antenna height of 20 meters)

+ 8

dB

(gain of receiving antenna, see A.4)

which adds up to -138 dB which is 5 dB’s more than the maximum loss of -133 dB so that this
setup will

not

guarantee reception under all circumstances.

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Содержание RX-C4

Страница 1: ...ll Waverider Receiver Manual RX C4 from serial no 60900 and firmware rev 60M02x11 March 20 2019 Service Sales Voltastraat 3 1704 RP Heerhugowaard The Netherlands 31 72 534 5298 31 72 572 6406 www datawell nl ...

Страница 2: ... used for receiving our Waveriders are fully similar with our receiver and antenna splitter tested by the Notified Body in 2015 and therefore compliant with our Declaration of Conformity Check if mains supply matches with the specifications of the device ...

Страница 3: ...ame Datawell Models 230 VAC 12 VDC 19 inch low high band complies with the essential requirements of the following applicable European Directives and carries the CE marking accordingly RE Directive 2014 53 EU ROHS Directive 2011 65 EU and conforms with the following product standards RED EN 301 489 1 EN 301 489 3 EN 60950 1 2006 A11 2009 A1 2010 A12 2011 A2 2013 Supplementary Information This DoC ...

Страница 4: ...4 ...

Страница 5: ... Changing the network settings 17 4 1 5 Info functions 18 4 2 Receiving data 18 4 2 1 GPS position 19 4 2 2 Signal quality 19 4 2 3 Speaker 20 4 3 Using the web interface 20 4 3 1 Web interface settings page 21 4 4 Retrieving data over a network 22 5 Troubleshooting 23 5 1 Power and fuses 23 5 2 Antenna signal quality and noise 23 5 3 Data interface 24 6 Specifications 25 7 Contact information 27 ...

Страница 6: ...6 ...

Страница 7: ...ith serial numbers and firmware revisions as shown on the cover The RX C4 is equipped with an easy to use electronic tuning system This makes it possible to tune exactly into a buoy frequency without the need to change the receiving crystal The RX C4 can be connected to a PC using RS232 or a LAN network connection When connected using a LAN network the RX C4 can be monitored and configured using a...

Страница 8: ...8 ...

Страница 9: ...nd back panel layout Figure 2 1 RX C4 front panel layout desktop version Figure 2 2 RX C4 front panel layout 19 rack mounted version The front panel contains the LCD and the buttons up speaker menu select and down ...

Страница 10: ...g connectors Socket for mains supply with fuses AC power supply version only Socket for DC power supply DC power supply version only Audio out for beat note monitoring Female 9 pin RS232 connector Network connector and leds green led indicates network connection red led indicates network activity Antenna input connector Figure 2 5 DC power connector pinout and cable ...

Страница 11: ...ntenna is a vertically polarized quarter wavelength whip The receiving end of the link should receive as much signal from the buoy transmitter and as little noise and interference as possible To achieve this the receiving antenna and station should preferably be located at or near the coast see Appendix A and Appendix D for more information Receiving antenna location and height The transmitter ant...

Страница 12: ...g Be aware of the fact that reception in most areas is limited by local noise and interference It pays to install the antenna in such a way that distance to local sources of noise and interference is maximized In these situations it is entirely acceptable to use a longer cable in order to install the antenna further away from a source of interference Using a directional antenna In case of weak sig...

Страница 13: ...r all kind of noises and disturbances Noise and trouble free reception should be possible without any connection or reference to ground However from a viewpoint of safety it is recommended to connect the receiver to a safety ground Normally the three wire power cord will take care of this 3 6 Lightning protection For effective protection against lightning strike it is advisable to connect the ante...

Страница 14: ...14 ...

Страница 15: ...te the configuration menu push and hold down the button After a few seconds of holding the button down the receiver will enter the configuration menu as shown in figure 4 1 Figure 4 1 The top menu with the EXIT function selected This is the top menu From here the memory info frequency and network settings can be accessed The and buttons are used to navigate through the menu items The currently sel...

Страница 16: ...4 3 From the preset menu the sto options stores the current reception frequency to a preset slot 1 6 The rcl options recalls a reception frequency from a preset slot 1 6 Figure 4 3 The preset menu with EXIT selected To save any changes made to the preset menu to non volatile memory be sure to properly exit the top menu 4 1 3 Changing the receiver mode The RX C4 can receive data in the HXV format a...

Страница 17: ...ress Select the ip menu item to enter the IP address menu To change the IP address use the and buttons to select the number byte of the address that needs to be changed see figure 4 5 The selected number is the number that is underlined To change the number press the button the lower digit of the number will start blinking and can now be changed using the and buttons Press the again to select anot...

Страница 18: ...ns are Act frequency This screen shows the actual frequency at which the buoy is currently being received The actual frequency may be different from the defined reception frequency This is due to frequency errors caused by for example temperature drifting in the buoy transmitter This is normal behaviour and no reason for concern Signal status This screen shows the quality of the incoming signal by...

Страница 19: ...GPS position When the buoy being received is equipped with a GPS module the GPS position of the buoy is shown on the display The GPS position message is rotated with the heave message according to the scheme shown in figure 4 7 Figure 4 7 Heave message and GPS message rotating scheme Note that the update rate of the GPS position is defined by the received buoy Please refer to the buoy documentatio...

Страница 20: ...d see paragraph 4 1 4 and connected to a LAN see paragraph 3 4 To access the web server from a computer enter the following address in the address bar of the web browser http RX C4 IP address For example when the RX C4 IP address is the default of 192 168 0 101 http 192 168 0 101 Figure 4 8 RX C4 web interface home page This will bring up the RX C4 web interface home page as shown in figure 4 8 Th...

Страница 21: ...anged by choosing the new mode from the pull down menu and clicking apply The receiver statistics on the web interface home page can be used to check if the receiver is correctly receiving data in the new mode For more information about the receiver mode refer to paragraph 4 1 3 Changing the password The default password is changed to a new password by entering the new password on the settings pag...

Страница 22: ...nning on TCP IP port 1180 This port is fixed and cannot be changed The data server has 4 so called slots available Each slot allows a single remote computer to receive data The status of these slots can be monitored from the web interface home page see paragraph 4 3 A slot is labelled IDLE if the slot is not currently sending data to a remote computer A slot is labelled CONNECTED if the slot is se...

Страница 23: ...he PC If none of these signals are available mains power is probably not OK please check the following Check mains or backup cabling Check if mains or backup voltages are OK For the AC version check both fuses Replace fuses if necessary and always both at the same time even if one of them seems OK1 The fuses are accessible from the backside of the RX C4 see paragraph 2 1 5 2 Antenna signal quality...

Страница 24: ... your vicinity due to other users If this is the case consider using another buoy transmitter frequency If the beat note is heard clearly but the receiver fails to synchronize the receiver may be set to the wrong receiving mode Refer to paragraph 4 1 3 to change the receiver mode 5 3 Data interface If the above suggestions check out OK the fault must lie with the data connection to the PC When usi...

Страница 25: ...nk Link bit rate 81 92 bits per second HXV mode 163 84 bits per second HVA mode Type of modulation 2FSK HXV mode 4FSK HVA mode Error detection BCH error correcting code HXV mode BCH RS concatenated error correcting code HVA mode Interfaces Audio 6 3mm jack connector mono output level 1 8 Vrms max output impedance 10 kΩ Serial female 9 pin D sub connector RS232 9600 bits per second 8N1 Pin 1 6 8 an...

Страница 26: ...26 ...

Страница 27: ...04 RP Heerhugowaard The Netherlands Tel 31 72 534 5298 Fax 31 72 572 6406 E mail sales datawell nl Service Voltastraat 3 1704 RP Heerhugowaard The Netherlands Tel 31 72 571 8219 Fax 31 72 571 2950 E mail servdept datawell nl Website www datawell nl ...

Страница 28: ...28 ...

Страница 29: ...of a buoy receiver system can be made with the numbers in decibels or decibel milliwatts and the calculation at the end of this appendix Figure A 1 H F buoy to receiver data link system A 1 Buoy transmitter The buoy transmitter converts the combined digital data stream which contains the wave height data wave spectra wave direction seawater temperature etcetera into a high frequency H F signal Tec...

Страница 30: ...nd Directional Waverider buoys except for the DWR G 0 4m The seawater around the buoy or another artificial ground plane is an important part of the antennas counterpoise and is therefore absolutely necessary for the buoy s transmission system in order to radiate its power efficiently In other words a buoy without a high conductance groundplane such as normal soil2 will have a severely limited ran...

Страница 31: ...he weaker the received buoy signal the more sensitive the communication link will be to errors induced by mechanisms such as interference and distant buoys transmitting at the same frequency Technical details The signal loss due to the distance between the transmitter ranges between 53 dB at 1 km separation and 112 dB at 60 km separation at 30 MHz over seawater while over dry city ground the loss ...

Страница 32: ...originates from man made equipment and is therefore often called manmade noise Interference signals can be of an intentional source such as another transmitter or from an unintentional source for instance the spark ignition from a car Over the last 20 years interference has increased significantly and over the next 20 years there is no reason to assume that this increase will be halted therefore i...

Страница 33: ... the link Error an out of band interferer damages my data although the buoy signal is strong Solutions use an attenuator7 at the input of the receiver use a directional antenna and or contact our service department Error an out of band interferer damages my data and the buoy signal is weak Solutions use a directional antenna and or contact our service department A 3 4 Propagation The maximum propa...

Страница 34: ...a higher and or closer to the buoy combat interferers as described above A 3 6 Existence of other buoy transmitters on the same frequency It is possible that buoys from your or from another organisation are being used on the same frequency10 in each other s neighbourhood This situation might endanger the receive quality of either Your buoy to your receiver communication The other buoy to the other...

Страница 35: ... The modulation type and protocols used for the others buoy to receiver data link From this we see that predicting data link quality in an interference limited case is a specialist job At Datawell we developed a prediction tool for the case of one Datawell MKIII buoy interfering with another Datawell MKIII buoy over direct sea paths Datawell might able to help you with this tool when you are in tr...

Страница 36: ...paragraphs but only if the transmission range is noise thus not interference limited The maximum difference between the transmitted power 17 dBm and the minimum receiving power 116 dBm is 133 dB Thus the sum of all following gains and losses 1 gain from the transmit antenna 2 dB 2 path loss due to distance and terrain type 50 up to infinity dB 3 losses due to wave height 0 15 dB 4 losses from othe...

Страница 37: ...see A 2 136 dB distance over fresh water ice see A3 1 10 dB max wave height 8 meters see A 3 5 10 dB some obstacles 10 dB normal antenna height of 20 meters 8 dB gain of receiving antenna see A 4 which adds up to 138 dB which is 5 dB s more than the maximum loss of 133 dB so that this setup will not guarantee reception under all circumstances ...

Страница 38: ... FF VVVV 16 bits of received data CR carriage return The status bits can have the following values 00 no errors data is OK 01 one or more errors in data repaired data is OK 02 07 too many errors in data detected data is NOT OK HVA format Shown below is an example of HVA data 1C 005000000001001000 7E7E7E 1D 002000002006001002 7E7E7E 1E 005001002004000002 7E7E7E A line of HVA data consists of a line...

Страница 39: ... Internet Protocol GPS Global Positioning System HF High Frequency HVA Hexadecimal Vector format A Hz Hertz HXV Hexadecimal Vector Format FER Frame Error Rate FSK Frequency Shift Keying LAN Local Area Network mem Memory MHz Mega Hertz LCD Liquid Crystal Display PC Personal Computer PCB Printed Circuit Board rcl Recall RF Radio Frequency RS Reed Solomon error correction code sto Store STP Shielded ...

Страница 40: ...40 Appendix D Receiving antennas Standard groundplane antenna Figure D1 Standard groundplane antenna ...

Страница 41: ...41 Adjust the antenna L1 and L2 lengths to the transmit frequency of the buoy Figure D2 Standard groundplane antenna continued ...

Страница 42: ...42 Figure D3 Directional quarter wave antenna ...

Страница 43: ...achieved by placing a reflector behind the receiving antenna to make it directional The antenna as shown has a forward gain of 3 dB that is equivalent to doubling the transmitter power More important is that it suppresses the noise received from the landside by 6 dB Usually this noise is the limiting factor not absolute signal strength Therefore the gain is 3 6 9 dB equivalent to having 8 times th...

Страница 44: ... the incoming data stream is often interrupted for several seconds The data server anticipates this by queuing the data vectors for up to 10 seconds This means that if for some reason the connection is interrupted or delayed for several seconds no data will be lost because the data server will buffer the data in its queue and retransmit the data as soon as the connection is available again However...

Страница 45: ...e capabilities of the software packages The RX C4 will output heave north and west displacements as well as a heave and directional spectrum which are programmed in the firmware The displacements and spectrum have the following characteristics and are easily distinguished from real wave data HXV demonstration mode Displacements 𝑑 𝑡 𝐴 sin 2𝜋𝑓𝑡 𝜙 The heave north and west displacements all have their...

Страница 46: ...ional spectrum Activate the demonstration mode To prevent customers from accidently set the RX C4 in demonstration mode the option is not incorporated in the default menu of the RX C4 Pressing the lower two buttons and for a second during start up of the RX C4 is required to activate the demonstration capabilities While activated you can either set the RX C4 in HXV or HVA demonstration mode using ...

Страница 47: ...the receiver modes HXV receiver mode for DWR MKIII DWR G or WR SG HVA receiver mode for DWR4 ACM HXVdemo receiver mode to demonstrate the DWR MKIII HVAdemo receiver mode to demonstrate the DWR4 ACM After selecting the preferred mode you must exit the menu Resetting the RX C4 will automatically disable the demonstration mode no extra actions are necessary It is not possible to set the RX C4 in demo...

Страница 48: ... with a male SMA connector at one side and a male N connector at the other side Use the mains cord to connect the power input with the wall outlet See the mains cord wiring leaflet for instructions to mount a mains connector to the cord The LED at the front side should be lit to indicate that the power splitter is ready for use Note Each unused splitter output should be terminated with a 50 Ω term...

Страница 49: ...o centre frequency of pass band Gain 9 dB Noise figure 5 5 dB Maximum input level 15 dBm Antenna input 50 Ω female N type connector Splitter outputs 6 x 50 Ω female SMA type connector General Power AC power standard 100 240 VAC 50 60 Hz 4W DC power optional 10 18 VDC 2 W Temperature range 10 C 50 C Relative humidity 10 80 non condensing Weight Desktop 1 4 Kg Weight 19 1 9 Kg Dimensions Desktop 230...

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